Analytical chemistry unit-3 MCQ M.Sc. Chemistry First year first semester

M. Sc. First year Postgraduate degree course

First Semester

CHE - 101

ANALYTICAL CHEMISTRY 

Unit-II. Basic Separation techniques: Distillation and Solvent and Solid Phase extraction

Distillation: Fractional distillation, distillation under vacuum, theory of operation of distillation methods, some practical considerations.  Solvent and Solid Phase extraction: Phase equilibrium, the partition coefficient the distribution ratio, theory of phase contact methods, single equilibrations, repeated equilibrations, counter current distribution, practical aspects and applications - extraction of metals, extraction of molecular species, ion pair extractions,  Accelerated and microwave assisted extraction, solid phase extraction, Numerical.

Multiple Choice questions

1. How will you separate a solution (miscible) of benzene and CHCI₃?
a)  Sublimation
b)  Distillation
c)   Filtration
d) Crystallisation
Answer :(b)

2. Which one of the following methods can be used to separate a mixture of ortho and para - nitrophenols? 
a)  Crystallisation
b)  Solubility
c)   Sublimation
d) Steam distillation
Answer:(d)

3. Which one of the following can be purified by sublimation? 
a)  F₂
b)  Cl₂
c)  I₂
d)  Br₂
Answer:(d)

4. Which is purified by steam distillation? 
a)  Aniline
b) Petroleum
c)  Benzoic acid
d) Napthalene
Answer:(a)

5. Sublimation is a process in which a solid:
a)  Changes into vapor form
b) Changes into another allotropic from
c)  Changes into liquid form
d) None of above
Answer:(a)

6. A mixture of camphor and benzoic acid can be separated by:
a)  Sublimation
b) Extraction with a solvent
c)  Chemical method
d) Fractional distillation
Answer:(c)

7. The best method for the separation of naphthalene and benzoic acid from their mixture is:
a)  Crystallisation
b) Solvent extraction
c)  Chromatography
d) Distillation
Answer:(b)

8. For the purification, isolation and separation of organic compounds, the latest technique followed is:
a)  Chromatography
b) Steam distillation
c)  Fractional crystallization
d) Sublimation
Answer:(a)

9. Which of the following reagents will be fruitful for separation of a mixture of nitrobenzene and aniline? 
a)  H₂O
b) Aqueous NaOH
c)  Aqueous NaHCO₃
d) Aqueous HCI
Answer:(d)

10. A liquid which decomposes at its boiling point can be purified by:
a)  Distillation at atmospheric pressure
b) Distillation under reduced pressure
c)  Fractional distillation
d) Steam distillation
Answer:(b)

11. Turpentine oil can be purified by:
a)  Steam distillation
b) Vacuum distillation
c)  Fractional distillation
d) Sublimation
Answer:(a)

12. Two substances when separated out on the basis of their extent of adsorption by one material, the phenomenon is called:
a)  Chromatography
b) Crystallisation
c)  Sublimation
d) Steam distillation
Answer:(a)

13. Vacuum distillation is used to purify liquids which:
a)  Are highly volatile
b) Are explosive in nature
c)  Soluble in water
d) Decomposes below their B.P's.
 Answer:(d)

14. Impure Naphthalene is purified by:
a)  Fractional crystallisation
b) Fractional distillation
c)  Solvent extraction
d) Sublimation
Answer:(b)

15. A very common adsorbent used in coloumn chromatography is:
a)  Powdered charcoal
b) Chalk
c)  Alumina
d) Sodium carbonate
Answer:(c)

16. The latest technique for the purification of organic compounds is:
a)  Fractional distillation
b) Vacuum distillation
c)  Chromatography
d) Crystallization
Answer:(b)

17. Fixed melting point of an organic compound informs:
a)  Purity of an organic compound. 
b) Conductivity of compound
c)  Chemical nature of compound
d) Whether the compound is liquid or gas. 
Answer:(a)

18. A mixture of camphor and KCl can be separated by:
a)  Sublimation
b) Decantation
c)  Evaporation
d) Filtration
Answer:(a)

19. In steam distillation, the sum of the vapor pressure of the volatile compound and that of water is:
a)  Equal to atmospheric pressure
b) Less than atmospheric pressure
c)  More than atmospheric pressure
d) Exactly half of the atmospheric pressure

Answer:(b)

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